The most complete and latest knowledge of cob led strip light in 2022
COB light strips have great advantages over ordinary SMD light strips because of the lack of light spots. As soon as they are listed, they attract everyone's attention and are very popular with domestic and foreign customers.
What’s cob led strip?
COB（Chips on Board） means that the chip is directly packaged on the PCB.
Cob led strip is the light strip that encapsulates the chip on the flexible board. Chips are mostly flip-chip, which are linearly solidified on the PCB board, and then a layer of packaging glue mixed with phosphor powder is directly dropped on the surface of the chip. The appearance is similar to a noodle sticking to the PCB board. The light emitted by the chip is refracted, reflected in the encapsulation colloid, and interacts with the phosphor powder. The colloid evenly emits light of different colors and color temperatures.
As a new type of linear lighting strip with high brightness and high CRI, the cob light strip has a beautiful appearance, soft and uniform light, no light spots, and has a variety of waterproof methods. It adopts flip-chip packaging technology, with good heat dissipation. Longer life.
what’s the raw materials of cob led strip？
LED Chip, Solder paste, flexible pcb, phosphor, silicone, segment terminal, adhesive, reel, etc.
What’s the features of cob led strip?
1. Linear light emission, uniform and continuous, no light spot; wider application range, stronger adaptability and better effect.
2. The linear light source has a large light-emitting angle, up to 140°, and the light-emitting surface angle can reach 180°.
3. Adopt COB flip-chip process, anti-sulfur and anti-oxidation.
4. High CRI, CRI>90, high color consistency, softer luminous surface.
5. The substrate directly dissipates heat, with small thermal resistance, better heat dissipation efficiency, less light decay and longer life.
6. The product line is rich in series, including single-color, two-color, RGB series, which can be arbitrarily matched with various thickness profiles and applied in various scenarios; with various controllers to achieve various intelligent effects.
How to connect the cob led strip together after they are cut?
It's simple, just connect the cut cob led stirp with connectors as below.
What’s the difference between cob led strip and smd led strip?
1. Due to the structural characteristics of the COB light strip, the light-emitting surface is a linear colloid; while the ordinary lamp bead type light strip, its structure is a luminous lamp bead, which is attached to the PCB board. Therefore, the light emitted by the COB light strip is much more uniform, linear, and has no light spots;
2. The COB light strip directly fixes the chip on the PCB, which reduces the heat conduction channel. At the same time, the high-density process makes the current on each chip doubled, and the heat dissipation performance is qualitatively improved. With the light of the COB light strip The decay is smaller and the life is longer;
3. The high density of COB light strips realizes the perfect linearity from point to line to surface, which is more in line with the designer's design concept of seeing the light but not the light, and the application field will be wider.
What’s the disadvantage of cob led strip?
1. The product series is single. Although cob light strips can now do single-color, two-color, RGB and RGBW, and even phantom light strips, there are fewer styles of each color in single color. Compared with ordinary smd light strips, the styles are relatively simple.
2. The technology is relatively unstable. For Symphony cob light strips, in fact, the technology itself is unstable, and product quality problems are prone to occur, such as virtual welding and signal garbled lights.
3. OEM&ODM costs are higher. Due to the high degree of production automation, cob light strips are suitable for mass production, and the cost of OEM or ODM is relatively high.
4. Can not do high power. Compared with ordinary SMD light strips, the brightness of cob light strips is insufficient; and because of circuit design reasons, cob light strips often cannot be used for high power, otherwise the brightness difference in the first place will be very detailed.
5. The market is relatively chaotic. The cob light strip is currently in its infancy, many manufacturers have entered, and the competition is fierce. In order to seize the market, some manufacturers reduce their costs by lowering their quality standards and cut prices significantly. Consumers are more difficult to distinguish between good and bad quality.
Will COB light strips replace traditional light strips in the future?
the answer is negative. The cob light strip is currently in its infancy, and it will inevitably eat away part of the traditional light strip market. However, due to the large limitations of cob light strips, it is impossible to completely replace the market of traditional light strips.
How to install cob led strip?
1)Clean the mounting surface during installation Before installing the light strip
please clean the sundries of the structure or the installation surface of the profile to keep the installation surface clean and free of dust or dirt, so as not to affect the sticking of the light strip.
2) Avoid sharp hard objects or high temperature objects hitting the colloid
During the installation process, avoid sharp and hard objects or high-temperature objects touching the surface of the colloid in the light-emitting area, so as not to damage the scald colloid, cause damage, and affect the luminous effect.
3) Precautions for light strip cutting
When the light strip is installed, the length of the light strip to be installed should be measured according to the site. When it needs to be cut, the excess light strip should be cut along the marking line of the COB light strip. If you need to add connecting wires, please solder them on the land marks where you cut them.
4) Light strip adhesive release paper
When sticking the light strip, peel off the release paper on the back and stick it. It is strictly forbidden to tear off all the release paper at one time, so as to prevent the light strips from sticking to each other.
5. Precautions for installation with profiles
When installing the light strip, pay attention to the place where the cutting point of the light strip is in contact with the bottom surface of the inner groove of the profile, and stick mylar tape to isolate it to avoid short circuit. When installing the light strip at the corner, it is strictly forbidden to fold it into a right angle, and it is strictly forbidden to directly bend it and stick it to the profile table.
6. Precautions for selection of suitable power supply
Light strips are generally powered by DC12V/24V (direct current). When selecting a power supply to drive, select a power supply with appropriate power according to the length of the light strip to be installed. The total power of the light strip should be lower than 80% of the rated power of the power supply. For example: When you need to use a 5meter long COB light strip, the voltage of led strip is 24V, the power of the strip is 12W/meter, and the total power is 5*12W=60W. It should be equipped with a 24V 100W drive power supply.
7. Pay attention to insulation treatment
After the light strip is installed, the light strip wire is connected to the power output end. Insulation, anti-short circuit and anti-corrosion treatment should be done at the terminals and terminals.
What’s the production process of cob led strip?
How to achieve the high-quality light effect of cob light strips? The rigorous and meticulous packaging process of the cob light strip ensures the excellent light effect of the cob light strip.
Detailed explanation of the 11-step process flow of cob light strip light source packaging:
Step 1: crystal expansion
The entire LED wafer film is evenly expanded by an expansion machine, so that the closely arranged LED crystal grains attached to the surface of the film are pulled apart, which is convenient for stinging the crystal.
Step 2: Adhesive
Put the crystal expansion ring on the surface of the adhesive machine that has scraped the silver paste layer, put the silver paste on the back, and apply the silver paste. .
The third step: thorn crystal
Put the prepared crystal expansion ring for the silver award into the thorn crystal frame, and thorn the led chip on the PCB printed circuit board with a thorn crystal pen
Step 4: Curing the Silver Paste
Put the thorned PCB printed circuit board into a thermal cycle oven for a period of time at a constant temperature, and take it out after the silver paste is cured
Step 5: Glue the Chip
Use a glue dispenser to place an appropriate amount of red glue or black glue on the IC position of the PCB printed circuit board, and then use an anti-static device to correctly place the IC bare chip on the red glue or black glue.
Step 6: Drying
Put the glued die into a thermal cycle oven and place it on a large flat heating plate at a constant temperature for a period of time, or it can be cured naturally.
Step 7: Bonding (wire)
Use an aluminum wire bonding machine to bridge the chip and the aluminum wire of the corresponding pad on the PCB, that is, the inner lead of the cob is welded.
Step 8: Pre-test
Use special testing tools to test cob boards, and rework the unqualified boards.
Step 9: Dispensing
Use a glue dispenser to dispense an appropriate amount of the prepared AB glue onto the bound LED die, and the IC is packaged with black glue, and then packaged according to customer needs.
Step 10: Curing
Put the sealed PCB printed circuit board in a thermal cycle oven at a constant temperature, and different drying times can be set according to actual requirements.
Step 11: Post-test
Use special testing tools to test the electrical performance of the packaged PCB printed circuit board to distinguish the good from the bad.
The overall packaging of the cob light strip light source is completed, and the complicated process is especially seen in the quality of the craftsmanship.
The cob light strip not only has a good light source effect, but also has good flexibility, folding resistance and bending resistance. It is suitable for a variety of installation environments, and is suitable for a variety of indoor and outdoor lighting designs. It is one of the preferred light strip products for lighting.
Hanron lighting is a cob led strip manufacturer for many years, ISO9001, CE, RoHS, Reach, ETL etc. Please feel to contact us if you have any cob request.
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